Internal-combustion engine



Feb. 1,1927. I ,3 1

E. PROUTY INTERNAL COMBUSTION ENGINE Filed 0m. 27, 1925 LLLL ' Emma @mu'vy Patented Feb. 1, 1927.

nnocn PROUTY, or Dn'rnorr- MICHIGAN.

INTERNAL-COMBUSTION ENGINE.

Application filed October 27, 1925. Serial No. 65,090.

The object of the invention is to so modify the construction of internal combustion engines, that the full benefit of the heat may be utilized; to provide a construction in 6 which the piston rings are not subjected to the high heat of the explosion and traverse a surface not exposed to the explosive charge; to provide for the dissipation of eX- cess heat; and to simplify the construction generally by the elimination of the conventional water jacket.

With this object in view, the invention consists in a construction and combination of parts of which a preferred embodiment is illustrated in the accompanying drawings, wherein: V

Figure 1 is a central vertical sectional view through the cylinder and piston of an engine constructed in accordance with the invention.

Figure 2 is a transverse sectional view on the plane indicated by the line 2-2 of Figure 1.

Since the invention resides solely in the construction'of cylinder and piston,- no other parts are necessary of illustration. In the illustrated embodiment, the cylinder 1.0 is extended beyond the normal height for such cylinders, as indicated at 11, the extended portion having thicker walls, as shown, and a head 12 being placed upon this upper extension. The fuel charge is admitted to the cylinder through the usual head as in the usual practice, the valve 1% serving for this purpose with a similar valve, unnecessary of illustration here, to take care of the exhaust.

The piston 15 is mounted in the cylinder and is operatively connected with the crank shaft by a connecting rod 16, as in the usual practice. tension 17 constituting a plunger which is separated from the body portion of the piston by a peripheral groove 18. The plunger 17 is equal in length to the extension of the cylinder but diametrically it is slightly less than the bore of the cylinder which is uniform throughout its length. The body portion of the piston fits the cylinder snugly and is provided with the piston rings 19.

The plunger 17, being slightly less in di- The piston, however, has an ex-- ameter'than the bore of the cylinder, there is no friction between it and the cylinder wall as the piston reciprocates and the upper end of the plunger being subjected to the effects of the explosion, it operates to shield 5 the body port-ion of the piston and to protect the cylinder wall and the piston rings from the deleterious effects of the explosive charge, the heat of which is dissipated through the plunger 17 and through the V thickened walls of the extension 11 of the cylinder.

The length of the cylinder and piston ex-' tensions, in practice, is approximately equal to the length of stroke of the piston.

The groove 18 serving to divide the body of the piston from the plunger 17, defines a top wall for the body portion of the piston and essentially makes it a separate element from the plunger, the latter being of a length equal to or approximately equal to the stroke of the piston, the oil lubricating V the wall of the cylinder never rises beyond the highest point reached by the groove 18 in the operation of the piston. the explosive charge is never contaminated by the oil andlikewise the-oil is not charred by the explosive charge nor the rings sub-V jected to the deleterious effect of the latter because of the plunger 17 intervening between the charge and the body portion of p the piston.

That section of the cylinder bounded by the extension 11 functions as a hot air chamber into which, in the operation of the engine, the fuel charge is introduced. This charge absorbing the heat from the walls of the extension 11, a perfect fuel mixture is obtained when the charge is compressed.-

This hot air chamber is always free from carbon whichmakes for the best fuel mixture and most eflicient ignition.

The invention having been described,what is claimed as new and useful is:

In an internal combustion engine construotion, a cylinder and piston operating therein, the cylinder having a solid wall extension beyond the point reached by the head of the piston, said extension enclosing a space constituting a hot air chamber, and the cyl- Therefore. 75

' inder having-an intake at the remote end of of the piston, said plunger being diametrically smaller than the bore ofthe cylinder and the hot air 'G-hamber, the plu'ngei'heing formed integral with the piston but separated therefrom by a deep peripheral groove in the plane of the piston head. 0 In testimony whereof he afiixes hissignw ture.

I OCH FEGUTY. 

